Added missing logger dependency in unittests.
Added missing logger dependency in unittests.

BUG=
R=chrisha@chromium.org, sebmarchand@chromium.org

Review URL: https://codereview.appspot.com/201470043

wangming28/syzygy,sebmarchand/syzygy,pombreda/syzygy,wangming28/syzygy,sebmarchand/syzygy,supriyantomaftuh/syzygy,ericmckean/syzygy,wangming28/syzygy,Eloston/syzygy,google/syzygy,supriyantomaftuh/syzygy,sebmarchand/syzygy,pombreda/syzygy,supriyantomaftuh/syzygy,supriyantomaftuh/syzygy,google/syzygy,ericmckean/syzygy,sebmarchand/syzygy,wangming28/syzygy,google/syzygy,ericmckean/syzygy,google/syzygy,Eloston/syzygy,pombreda/syzygy,pombreda/syzygy,ericmckean/syzygy,pombreda/syzygy,ericmckean/syzygy,sebmarchand/syzygy